#VU10847 Improper access control in systemd - CVE-2017-18078

Vulnerability identifier: #VU10847

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-18078

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
systemd
Server applications / Other server solutions

Vendor: Freedesktop.org

Description
The vulnerability allows a local attacker to bypass security restrictions on the target system.

The weakness exists in the systemd-tmpfiles due to improper access restrictions. A local attacker can bypass intended access restrictions via vectors involving a hard link to a file for which the user lacks write access.

Mitigation
Update to version 237.

Vulnerable software versions

systemd: All versions

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External links
https://github.com/systemd/systemd/issues/7736

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.